JP3544314B2 - Apparatus and method for manufacturing resin film - Google Patents

Description

【００２７】
表１に示す結果から判るように、本発明（試験Ｎｏ．２〜４）によれば、サポートロール１８を密着装置１１に対応させて設けることで、エンドレスベルト４の変動量が大幅に小さく抑えられる。密着装置１１の吸引圧力を低下させた場合にあっても、吸引圧力の変動量を低減することによりサポートロール１８無しの場合に比べてより高い製膜速度を達成でき（試験Ｎｏ．２、Ｎｏ．３）、密着装置１１の吸引圧力を同じ圧力に設定した場合には、吸引圧力の変動量を小さく抑えることにより、さらに大幅な製膜速度の向上を達成できた（試験Ｎｏ．４）。製膜速度は、通常、高速になる程フイルムにエアを噛み込み、フイルム破れにつながることから、可能な製膜速度の上限がその装置の能力を示すパラメータとなる。
【００２８】
【発明の効果】
以上説明したように、本発明の樹脂フイルムの製造装置および製造方法によれば、気体圧を作用させる密着装置に対応させてサポートロールを付加することにより、樹脂フイルムのキャスト状態を極めて安定させることができ、製膜速度の大幅な向上を達成できる。
【図面の簡単な説明】
【図１】本発明の一実施態様に係る樹脂フイルムの製造装置の概略構成図である。
【図２】図１の装置の拡大部分側面図である。
【図３】本発明の別の実施態様に係る樹脂フイルムの製造装置の部分側面図である。
【符号の説明】
１ 樹脂フイルムの製造装置
２ 口金
３ 樹脂膜
４ エンドレスベルト
５ａ、５ｂ ドラム
６ 着地点
７ 着地ロール
８ 送風装置
９ 剥離ロール
１０ 成形されたフイルム
１１、２１ 密着装置
１２ 第１吸引口
１３ 第２吸引口
１４ 第１減圧室
１５ 第２減圧室
１６、１７ 距離センサ
１８、２２ サポートロール[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an apparatus and a method for manufacturing a resin film, and more particularly, to manufacturing a resin film suitable for an apparatus for molding a film by discharging a molten resin or a resin having fluidity dissolved in a solvent from a slit gap of a die. The present invention relates to an apparatus and a manufacturing method.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, there has been known a manufacturing apparatus in which a molten resin or a solution resin is extruded into a film shape from a die having a slit-shaped discharge port, brought into close contact with a cast surface, and then cooled or dried to form a resin film. For example, Japanese Unexamined Patent Publication No. 9-29767 discloses a landing roll (support roll) that casts a resin film discharged from a die on an orbiting endless belt and supports the endless belt on the back side of the endless belt at the point of application of the resin film. ) Is disclosed.
[0003]
In such a resin film manufacturing equipment, how to stabilize the resin film from the die and make it adhere to the endless belt surface has a fundamental effect on the subsequent processes and is an important factor that affects product quality. Has become.
[0004]
[Problems to be solved by the invention]
When the resin film is cast on the endless belt, if the distance between the die and the endless belt surface on which the resin film lands is changed, it becomes difficult to perform stable film formation. In particular, in order to stabilize the casting of the resin film on the endless belt, a decompression region is created upstream from the point of landing of the resin film, and the resin film immediately before landing is sucked to stabilize its behavior. There is a method of generating a pressurized area downstream from the landing point, and pressing the resin film immediately after landing to make good contact with the belt surface, but a means for applying such gas pressure is added. Then, the fluctuation of the gas pressure of the means directly acts on the resin film, which eventually promotes the fluctuation of the endless belt, and the expected cast stabilizing effect may not be obtained.
[0005]
In the above-mentioned Japanese Patent Application Laid-Open No. 9-29767, it is described that in order to mechanically suppress the fluctuation of the endless belt itself, a damping roll different from the landing roll is provided near the landing roll. No measures have been taken with respect to the case of providing a contact device for applying the gas pressure as described above. Therefore, when such a contact device is provided, there is a possibility that a stable film formation state cannot be obtained.
[0006]
Accordingly, an object of the present invention is to stabilize the behavior of a resin film immediately before or immediately after landing on an endless belt by using a contact device that applies gas pressure in the production of a resin film employing an endless belt method as a cast surface. It is another object of the present invention to provide a resin film manufacturing apparatus and a manufacturing method capable of suppressing the amount of fluctuation of the endless belt and realizing extremely stable casting as a whole.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, a resin film manufacturing apparatus of the present invention casts a resin film discharged from a die on a circling endless belt, and provides an endless belt A manufacturing apparatus for a resin film provided with a landing roll for supporting a resin film, comprising: a bonding device that applies gas pressure to the resin film in order to make the resin film adhere to the endless belt surface, adjacent to the base; And a support roll for supporting the endless belt is provided on the back side of the endless belt corresponding to the position of (1).
[0008]
The adhesion device is a device that generates a decompression region upstream of the resin film landing point, such as a suction nozzle or a decompression chamber provided with a decompression means, or a pressure region downstream of the resin film landing point. For example, a pressure chamber or a pressure nozzle for applying a static pressure or blowing a gas (applying a dynamic pressure).
[0009]
The deflection of the support roll is preferably 100 μm or less when a predetermined tension is applied to the endless belt, and the deflection of the landing roll is also preferably 100 μm or less.
[0010]
Such an apparatus is particularly suitable when the resin film is a solution film containing a resin component, that is, applied to a so-called solution film formation. A typical example of the resin component is a polyamide component.
[0011]
Further, in the method for producing a resin film according to the present invention, the resin film discharged from the die is cast on an orbiting endless belt, and the endless belt is supported by a landing roll from the endless belt back side at the landing point of the resin film. In the method of manufacturing a resin film, the resin film is brought into close contact with the surface of the endless belt by applying gas pressure to the resin film by a contact device, and the endless belt is supported by a support roll from the back side of the endless belt corresponding to the position of the contact device. Thus, the variation of the endless belt is suppressed to 1 mm or less.
[0012]
Also in this method, as a method of applying the gas pressure, a method of generating a depressurized region upstream from the point of application of the resin film by a contact device, or a method of applying a pressure region downstream of the point of application of the resin film Can be adopted.
[0013]
In the resin film manufacturing apparatus and the manufacturing method according to the present invention, the resin film ejected from the die just before landing on the endless belt surface, the landing, or the behavior immediately after landing by the contact device that applies gas pressure. However, at this time, a support roll is provided separately from the landing roll at the position corresponding to the contact device and on the back side of the endless belt, so belt fluctuation due to deflection and distortion of the belt itself At the same time, the fluctuation of the belt caused by the fluctuation of the gas pressure of the contact device is suppressed, and as a result, the fluctuation of the gas pressure caused by the fluctuation of the belt is also suppressed. As a result, the action of the gas pressure by the contact device is exerted with maximum stability, and the cast state of the resin film is stabilized.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
First, the resin, which is a raw material of a film manufactured using the resin film manufacturing apparatus of the present invention, is not particularly limited as long as it can be melted or has fluidity as a solution and can be formed into a film. For example, thermoplastic resins represented by polyolefins such as polypropylene and polyethylene, polyesters such as polyethylene terephthalate and the like, or heat-resistant resins, particularly polyamide resins such as meta-aramid and para-aramid resins are exemplified. Needless to say, additives such as a stabilizer and an antistatic agent may be added to the resin used.
[0015]
FIG. 1 shows a schematic configuration of an apparatus and a method for manufacturing a resin film according to an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes an entire manufacturing apparatus including a cast portion, and a resin film 3 is discharged in a film shape from a die 2 for continuously extruding a resin having fluidity. Below the base 2, an endless belt 4 forming a cast surface is circulated. The endless belt 4 is stretched between two drums 5a and 5b, one of which is a driving drum and the other is a driven drum. It is orbited with tension applied.
[0016]
A landing roll 7 that supports the endless belt 4 from below is provided immediately below or immediately below the landing point 6 of the resin film 3 from the base 2 to the surface of the endless belt 4 and on the back side of the endless belt 4. Have been. The landing roll 7 may be any of a driving roll, a free roll, and an assisting roll assisted by a rotational torque. The run-out of the landing roll 7 is preferably 100 μm or less when a predetermined tension is applied to the endless belt 4.
[0017]
The resin film cast on the endless belt 4 is sent in the belt rotation direction along with the movement of the casting surface accompanying the rotation of the endless belt 4. In the present embodiment, a plurality of air blowers 8 are arranged at appropriate positions on the front side and the back side of the endless belt 4, and the resin film is cooled and / or the solvent is removed from the resin film. The formed film 10 is peeled off from the endless belt 4 circulated to the roll 5a via the peeling roll 9, and is sent to the next step.
[0018]
In the present embodiment, the resin film 3 is brought into close contact with the surface of the endless belt 4 by applying gas pressure to the base 2 at a position upstream of the landing point 6 of the resin film 3 and adjacent to the base 2. A contact device 11 is provided. The contact device 11 includes a suction device (decompression device) that generates a decompression region upstream of the landing point 6. In the present embodiment, the first suction port 12, the second suction port 13, the first decompression chamber 14, It has a second decompression chamber 15. The first decompression chamber 14 and the second decompression chamber 15 are respectively connected to appropriate suction means (for example, a blower or a vacuum pump), and the degree of decompression can be controlled independently of each other. In the decompression region by suction from the first suction port 12 and / or the second suction port 13, the negative pressure may be applied to the resin film 3 as a static pressure or may be applied as a dynamic pressure. Reference numerals 16 and 17 denote sensors for detecting the distance between the endless belt 4 and the distance between the endless belt 4 and the base 2 and the contact device 11 for a test described later, respectively. I have.
[0019]
A support roll 18 that supports the endless belt 4 is provided at a position corresponding to the contact device 11 (that is, a position immediately below the contact device 11) and on the back side of the endless belt 4. The deflection of the support roll 18 is preferably 100 μm or less in a state where a predetermined tension is applied to the endless belt 4. Further, the support roll 18 may be a free roll, but may be an assisting roll in which rotational torque is assisted. Although the material of the roll surface is not particularly limited, a metal roll is more preferable than a roll whose surface is made of an elastic material such as rubber from the viewpoint of precisely regulating the position of the endless belt 4 and suppressing the amount of fluctuation. .
[0020]
FIG. 3 shows a cast portion of an apparatus for manufacturing a resin film according to another embodiment of the present invention. In the present embodiment, a pressurized region is generated as a contact device 21 for applying a gas pressure to the base 2 on the downstream side from the landing point 6 of the resin film 3 to generate a static pressure or dynamic pressure of gas (air). A pressure chamber or a gas blowing nozzle for pressing the resin film 3 onto the surface of the endless belt 4 by pressure is provided. The positive pressure in the pressurized region generated by the adhesion device 21 may also act as a static pressure or a dynamic pressure on the resin film 3.
[0021]
A support roll 22 that supports the endless belt 4 is provided at a position corresponding to the contact device 21 (that is, a position substantially directly below the contact device 21) and on the back side of the endless belt 4. The support roll 22 may have the same configuration as the support roll 18 described above.
[0022]
In the resin film manufacturing apparatus configured as described above, first, the position of the endless belt 4 is regulated by the landing roll 7 immediately below the base 2, and the resin film 3 from the base 2 is placed on the surface of the endless belt 4. Is landed. The variation of the endless belt 4 at the landing point 6 is suppressed by the landing roll 7, and the behavior of the resin film 3 that lands is stabilized by the action of the gas pressure by the contact device 11 (or the contact device 21).
[0023]
Since the support roll 18 (or the support roll 22) is provided at a position corresponding to the contact device 11 (or the contact device 21), not only at the landing point 6 but also immediately before (or immediately after) the landing point 6 Also, the fluctuation of the endless belt 4 is suppressed, and the casting behavior of the resin film 3 is further stabilized.
[0024]
Factors of the fluctuation of the endless belt 4 immediately before (or immediately after) the landing point 6 include the deflection and distortion of the belt itself and the fluctuation of the gas pressure in the contact device 11 (or the contact device 21). Among them, the fluctuation caused by the former is simply mechanically suppressed by the support roll 18 (or the support roll 22), but the fluctuation caused by the fluctuation of the gas pressure is the fluctuation of the belt 4 due to the fluctuation of the gas pressure. However, the fluctuation of the belt 4 causes the gas pressure to fluctuate. In the present invention, since the support roll 18 (or the support roll 22) is provided at a position corresponding to the contact device 11 (or the contact device 21), both of the above-mentioned fluctuation factors are suppressed to be small, and a more stable cast state is obtained. Is achieved.
[0025]
Incidentally, in the embodiment shown in FIG. 1 and FIG. 2, when the solution film formation of the polyamide film was tested using the sensors 16 and 17, the results shown in Table 1 were obtained.
[0026]
[Table 1]

[0027]
As can be seen from the results shown in Table 1, according to the present invention (Test Nos. 2 to 4), by providing the support roll 18 in correspondence with the close contact device 11, the amount of fluctuation of the endless belt 4 is significantly reduced. Can be Even when the suction pressure of the adhesion device 11 is reduced, a higher film forming speed can be achieved by reducing the fluctuation amount of the suction pressure as compared with the case without the support roll 18 (Test Nos. 2 and No. .3), when the suction pressure of the contact device 11 was set to the same pressure, it was possible to achieve a further significant improvement in the film forming speed by suppressing the fluctuation amount of the suction pressure (Test No. 4). Generally, the higher the film forming speed, the higher the speed, the more the air is caught in the film, leading to film breakage. Therefore, the upper limit of the possible film forming speed is a parameter indicating the capability of the apparatus.
[0028]
【The invention's effect】
As described above, according to the apparatus and method for manufacturing a resin film of the present invention, the cast state of the resin film can be extremely stabilized by adding a support roll corresponding to a contact device that applies gas pressure. And a large increase in film forming speed can be achieved.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of an apparatus for manufacturing a resin film according to an embodiment of the present invention.
FIG. 2 is an enlarged partial side view of the apparatus of FIG. 1;
FIG. 3 is a partial side view of an apparatus for manufacturing a resin film according to another embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Resin film manufacturing apparatus 2 Cap 3 Resin film 4 Endless belt 5a, 5b Drum 6 Landing point 7 Landing roll 8 Blowing device 9 Peeling roll 10 Molded film 11, 21 Adhesion device 12 First suction port 13 Second suction port 14 First decompression chamber 15 Second decompression chamber 16, 17 Distance sensor 18, 22 Support roll

Claims (9)

The resin film discharged from the base is cast on a circling endless belt, and a resin film manufacturing apparatus provided with a landing roll supporting the endless belt on the endless belt back side at the landing point of the resin film. A support roll that has an adhering device that applies gas pressure to the resin film in order to adhere the resin film to the surface of the endless belt and that supports the endless belt on the back surface of the endless belt corresponding to the position of the adhering device An apparatus for producing a resin film, comprising: The apparatus for manufacturing a resin film according to claim 1, wherein the contact device generates a decompression region upstream of the landing point of the resin film. The apparatus for manufacturing a resin film according to claim 1, wherein the contact device is configured to generate a pressurized area downstream of the landing point of the resin film. The resin film manufacturing apparatus according to claim 1, wherein a deflection of the support roll is 100 μm or less in a state where a predetermined tension is applied to the endless belt. The apparatus for manufacturing a resin film according to claim 1, wherein the resin film is a solution film containing a resin component. 6. The resin film manufacturing apparatus according to claim 5, wherein said resin component is a polyamide component. The resin film discharged from the mouthpiece is cast on a circling endless belt, and in a method for manufacturing a resin film in which the endless belt is supported by a landing roll from the endless belt back side at the point of application of the resin film, a bonding device is used to adhere to the resin film. By applying gas pressure to adhere the resin film to the surface of the endless belt, and by supporting the endless belt from the back side of the endless belt corresponding to the position of the adhesion device with a support roll, the amount of fluctuation of the endless belt is reduced to 1 mm or less. A method for producing a resin film, characterized in that it is suppressed. The method for manufacturing a resin film according to claim 7, wherein the pressure-contact region is generated by the adhesion device upstream of the landing point of the resin film. The method for manufacturing a resin film according to claim 7, wherein a pressurized region is generated downstream of the landing point of the resin film by the adhesion device.

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